metamorphic
Banded calcite (likely marble or calcite-rich limestone)
Calcite, CaCO₃; possibly calcitic marble
AI-generated identification · may be incorrectPale greenish-white, strongly banded and foliated-looking, with a dull to silky luster. Calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71; it should fizz with dilute hydrochloric acid or vinegar (more slowly).
Identified More metamorphic →
Explore Banded calcite (likely marble or calcite-rich limestone) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale greenish-white, strongly banded and foliated-looking, with a dull to silky luster. Calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71; it should fizz with dilute hydrochloric acid or vinegar (more slowly).
Formation & geological history
Likely formed from carbonate sediment that recrystallized during metamorphism, producing interlocking calcite bands; alternatively it may be banded limestone. Exact age cannot be determined from the photograph.
Uses & applications
Decorative stone, carving, architectural marble, and collector specimens. Common-quality pieces generally have little commercial value.
Geological facts
The layered appearance may be compositional banding rather than true sedimentary bedding. Calcite can be distinguished from feldspar by its acid reaction and softer hardness.
Field identification & locations
The Cebu area near 10.3°N, 123.9°E contains abundant carbonate rocks and metamorphosed carbonate material, so this identification is regionally plausible. Test an inconspicuous edge with vinegar, check for rhombohedral cleavage, and avoid confusing it with pale-green serpentinite or altered rock.
More like this
